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9.27.11.2.(1)
ApplicationIntent
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
[F20,F22-OS2.1,OS2.3]
[F20-OS2.1,OS2.3,OS2.4] [F22-OS2.3,OS2.4,OS2.5] Applies where panel-type cladding is installed to provide the required bracing.
Application
Application 1: 
Minimum thickness of OSB conforming to the O-2 grade of CSA O437.0, “OSB and Waferboard,” installed directly over sheathing as cladding, on buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability that OSB cladding will not be strong enough or rigid enough.
This is to limit the probability of:
  • an inadequate resistance to accidental impact forces or wind loads, which could lead to excessive deflection, the deformation, displacement or cracking of cladding, the opening of joints, or the failure of caulking, or
  • where support spacing does not exceed 400 mm and panel-type plywood cladding is installed as bracing to satisfy Subclause 9.23.10.2.(2)(b)(i), an inability to resist lateral loads, which could lead to racking of exterior walls.
This is to limit the probability of:
  • precipitation or meltwater ingress, which could lead to deterioration, which could lead to the structural failure of exterior walls or of elements supported or protected by exterior walls,
  • falling cladding elements, or
  • where panel-type cladding is installed as bracing to satisfy Subclause 9.23.10.2.(2)(b)(i):
    • structural failure, or
    • the excessive deformation, displacement or failure of required environmental separation elements, which could lead to deterioration, which could lead to compromised structural integrity of exterior walls or of elements supported or protected by exterior walls.
This is to limit the probability of harm to persons.
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